CVE-2026-8390

HIGHNVD 7.37.3—

7.3

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

CVSS v3: 7.3
EG Score: 7.3(high)
EPSS: 4.3%
KEV: Not listed

Published

May 12, 2026

Last Modified

May 14, 2026

Advisory Details (2)

Auto-updated May 14, 2026

No patch confirmed yet.

generic

Security Vulnerabilities fixed in Firefox 150.0.3 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-45/

generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2038081

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

Data Freshness Timeline

(refreshed 8× in last 7d / 13× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-21 22:43 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 12:58 UTCEG score recompute
2026-05-20 12:58 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch

Frequently asked(5)

What is CVE-2026-8390?

CVE-2026-8390 is a high vulnerability published on May 12, 2026. Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

When was CVE-2026-8390 disclosed?

CVE-2026-8390 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-8390 actively exploited?

CVE-2026-8390 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-8390?

CVE-2026-8390 has a CVSS v3 base score of 7.3 (NVD).

How do I remediate CVE-2026-8390?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8390, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-8390

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CVE-2026-8390

📅 Published

🔄 Last Modified

📋 Advisory Details (2)